They say that one bad apple doesn't spoil the whole bunch, but for the Catholic Church, the bad apples have been particularly rotten, and the more we learn, the more we realize that good portions of the bunch were letting them get away with it. If you don't want to spoil the bunch, you've got to take the rotten apples out. In the Church, the rot spread.
The worst part is that we're still learning more and new ways that things went bad and good people suffered. But the Church is finally owning up to some of it.